All 20 are identical, English-language with standard card backs
Yorion does make you play 80 cards instead of 60, but for decks not reliant on drawing specific cards early in order to win, there is enough redundancy in Magics rich card pool to make Yorions caveat not too big a deal
Another perfect example of this is Isshin, Two Heavens As One, which reads: "If a creature attacking causes a triggered ability of a permanent you control to trigger, that ability triggers an additional time." This is an incredible ability to have on a commander - and building a Commander deck around it is sure to be a blast - but in a Standard set it just feels off
If youre after a specific one of them, those odds leap to one in 2,520 (or $23,730 worth of packs)
with Pendulum Magicians being one of the few exceptions
Starting Player: Who starts the duel